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Readout circuit for a sensor system and sensor system

Pending Publication Date: 2022-08-11
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about an improved readout circuit for a capacitive differential sensor that can produce a periodic output signal. The invention also includes an improved sensor system. Its technical effects include better sensing precision, faster readout speed, and reduced noise levels.

Problems solved by technology

One problem with C / V converters are offsets at the inputs of the C / V converter, which are based on inaccuracies in the design of the C / V converter.

Method used

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  • Readout circuit for a sensor system and sensor system
  • Readout circuit for a sensor system and sensor system
  • Readout circuit for a sensor system and sensor system

Examples

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Embodiment Construction

[0032]FIG. 1 schematically shows a representation of a sensor system 200 including a readout circuit 100 according to one specific embodiment.

[0033]In the specific embodiment shown, sensor system 200 includes a capacitive differential sensor 201 and a readout circuit 100. Readout circuit 100 includes a capacitance-to-voltage converter 107 and a feedback circuit 101.

[0034]Capacitance-to-voltage converter 107 includes two input connections INP, INN and two output connections OutP, OutN and is configured to amplify capacitive output signals of capacitive differential sensor 201 and to convert them into correspondingly amplified voltage signals.

[0035]Capacitance-to-voltage converter 107 further includes two further feedback capacitors Cf, which are configured according to the related art to feed a capacitive feedback signal in the form of signal charges into input connections INP, INN.

[0036]Feedback circuit 101 is connected in parallel to further feedback capacitors Cf and is interconne...

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Abstract

A readout circuit for a capacitive differential sensor including periodic output signals. The readout circuit includes: one capacitance-to-voltage converter for output signals of the sensor; and one feedback circuit including a sampling unit and a filter unit, the sampling unit being configured to sample a differential signal of two oppositely-phased output signals of the capacitance-to-voltage converter and to generate a sampled differential signal, the filter unit being configured to average the sampled differential signals and to generate an averaged differential signal, and the feedback circuit being configured to feed the averaged differential signal as feedback into the capacitance-to-voltage converter. A sensor system including a readout circuit is also described.

Description

CROSS REFERENCE[0001]The present application claims the benefit under 35 U.S.C. § 119 of German Patent Application No. DE 10 2021 201 149.7 filed on Feb. 8, 2021, which is expressly incorporated herein by reference in its entirety.FIELD[0002]The present invention relates to a readout circuit for a capacitive differential sensor including periodic output signals. The present invention further relates to a sensor system including a readout circuit.BACKGROUND INFORMATION[0003]MEMS gyroscope sensors are found increasingly in personal electronic devices and IOT devices. For most of these applications, the power consumption is a very critical parameter, at the same time, however, performance parameters such as noise should also be continually improved upon.[0004]One of the most critical circuit blocks in the gyroscope system is the first readout block, which is usually implemented as a capacitance-to-voltage converter (C / V converter) and contributes significantly to the entire noise budge...

Claims

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Application Information

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IPC IPC(8): G01R27/26H03K5/1252G01P3/48
CPCG01R27/2605G01P3/4802H03K5/1252G01C19/5776
Inventor VISCONTI, ANDREADIAZZI, FRANCESCOVALLI, LUCA
Owner ROBERT BOSCH GMBH